Thread fixes (#1205)

* don't use multiple threads in torture tests, which are parallel anyhow

* if we fail to create a thread, don't use multiple threads

1 files changed, 8 insertions, 1 deletions

diff --git a/src/support/threads.cpp b/src/support/threads.cpp
index 3e32ffb15..31c900ceb 100644
--- a/src/support/threads.cpp
+++ b/src/support/threads.cpp
@@ -111,7 +111,14 @@ void ThreadPool::initialize(size_t num) {
   ready.store(threads.size()); // initial state before first resetThreadsAreReady()
   resetThreadsAreReady();
   for (size_t i = 0; i < num; i++) {
-    threads.emplace_back(make_unique<Thread>());
+    try {
+      threads.emplace_back(make_unique<Thread>());
+    } catch (std::system_error&) {
+      // failed to create a thread - don't use multithreading, as if num cores == 1
+      DEBUG_POOL("could not create thread\n");
+      threads.clear();
+      return;
+    }
   }
   DEBUG_POOL("initialize() waiting\n");
   condition.wait(lock, [this]() { return areThreadsReady(); });